[cpp] Add Qt Desginer widget plugin examples

cpp/qt/designer-plugin-collection/widgetplugincollection.cpp

@@ -0,0 +1,28 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Collection of widget plugins for Qt Designer                        ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+*/
+
+#include "widgetplugincollection.h"
+#include "textview.h"
+#include "treeview.h"
+#include "widgetplugin.h"
+
+WidgetPluginCollection::WidgetPluginCollection(QObject *parent)
+    : QObject(parent), m_collectionName("Klips Widget Plugin Collection") {
+  m_collection = {
+      new WidgetPlugin(m_collectionName, "Text View Widget", "text-view.h",
+                       [](QWidget *parent) { return new TextView(parent); }),
+      new WidgetPlugin(m_collectionName, "tree-view",
+                       [](QWidget *parent) { return new TreeView(parent); }),
+
+  };
+}
+QList<QDesignerCustomWidgetInterface *>
+WidgetPluginCollection::customWidgets() const {
+  return m_collection;
+}